sillimanite
noun
sillimanite is spelled S-I-L-L-I-M-A-N-I-T-E. The wrong spelling people search most is silimanite: about 10 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 16 of all searches for the word. Sillimanite is a noun meaning “A fibrous neosilicate mineral, polymorphic with andalusite and kyanite, with the chemical formula Al₂SiO₅”. The plural of sillimanite is sillimanites.
How many letters and syllables are in sillimanite?
| Letters | 11: S-I-L-L-I-M-A-N-I-T-E |
|---|---|
| In writing | about once in every 40 million words; the 194,306th most frequent word form |
| Wrong spellings searched | 1; the most searched, silimanite, about 10 Bing searches a month (all of them) |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026).
How do you spell sillimanite?
Sillimanite is spelled S-I-L-L-I-M-A-N-I-T-E. One wrong spelling is searched or written often enough to measure; together they are about 1 in 16 of the searches for sillimanite in either form.
Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.
How common is sillimanite?
Sillimanite appears about once in every 40 million words in written English, the 194,306th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Forms of sillimanite
- sillimanites plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does sillimanite mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A fibrous neosilicate mineral, polymorphic with andalusite and kyanite, with the chemical formula Al₂SiO₅.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Sillimanite in Spanish, French, German and Portuguese
In the sense mineral:
| Language | Words |
|---|---|
| French | sillimanite |
| German | Sillimanit |
| Spanish | silimanita |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does sillimanite come from?
From Silliman + -ite. Named after American chemist and geologist Benjamin Silliman (1779-1864) in 1824.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).